Business and personal correspondence; accounts, inventory, legal papers, monthly statements and vouchers for Plumas-Eureka
Mine; proofs of labor upon various mining claims.

Background

Mentor Etnyre was an engineering geologist and prospector. He promoted mining ventures in the western United States. He managed
mining operations at the Plumas-Eureka Mine near Johnsville, Plumas County, California for a short time in the mid 1930s and
held mining claims in the adjoining Jamison Creek area.